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-<h1>qopencamwidget.cpp</h1><a href="qopencamwidget_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
-<a name="l00002"></a>00002 <span class="comment"> This file is one part of two, that together make</span>
-<a name="l00003"></a>00003 <span class="comment"> QOpenCamWidget, a Qt 4 widget that displays video input </span>
-<a name="l00004"></a>00004 <span class="comment"> from a webcam, along with an optional snapshot button.</span>
-<a name="l00005"></a>00005 <span class="comment"></span>
-<a name="l00006"></a>00006 <span class="comment"> Copyright (C) 2009 Jon Langseth</span>
-<a name="l00007"></a>00007 <span class="comment"></span>
-<a name="l00008"></a>00008 <span class="comment"> This program is free software; you can redistribute it and/or</span>
-<a name="l00009"></a>00009 <span class="comment"> modify it under the terms of the GNU General Public License</span>
-<a name="l00010"></a>00010 <span class="comment"> as published by the Free Software Foundation in its version 2</span>
-<a name="l00011"></a>00011 <span class="comment"> of the License.</span>
-<a name="l00012"></a>00012 <span class="comment"></span>
-<a name="l00013"></a>00013 <span class="comment"> This program is distributed in the hope that it will be useful,</span>
-<a name="l00014"></a>00014 <span class="comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
-<a name="l00015"></a>00015 <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
-<a name="l00016"></a>00016 <span class="comment"> GNU General Public License for more details.</span>
-<a name="l00017"></a>00017 <span class="comment"></span>
-<a name="l00018"></a>00018 <span class="comment"> You should have received a copy of the GNU General Public License</span>
-<a name="l00019"></a>00019 <span class="comment"> along with this program; if not, write to the Free Software</span>
-<a name="l00020"></a>00020 <span class="comment"> Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.</span>
-<a name="l00021"></a>00021 <span class="comment"> */</span>
-<a name="l00022"></a>00022
-<a name="l00023"></a>00023 <span class="preprocessor">#include "<a class="code" href="qopencamwidget_8h.html">qopencamwidget.h</a>"</span>
-<a name="l00024"></a>00024
-<a name="l00025"></a>00025 <span class="comment">// ------------------------------------------------------------- //</span>
-<a name="l00026"></a>00026 <span class="comment">// Constructor and Destructor</span>
-<a name="l00027"></a>00027 <span class="comment">// ------------------------------------------------------------- //</span>
-<a name="l00028"></a>00028
-<a name="l00060"></a><a class="code" href="classQOpenCamWidget.html#5835e06a54f1b09b4fd157d88dc72b6e">00060</a> <a class="code" href="classQOpenCamWidget.html#5835e06a54f1b09b4fd157d88dc72b6e" title="Consctructs a QWidget based widget for displaying video coming from an OpenCV capture...">QOpenCamWidget::QOpenCamWidget</a>(QWidget *parent)
-<a name="l00061"></a>00061 : QWidget(parent)
-<a name="l00062"></a>00062 {
-<a name="l00063"></a>00063 <span class="comment">// private CvCapture *nextFrame from class definition</span>
-<a name="l00064"></a>00064 <a class="code" href="classQOpenCamWidget.html#92dab283a477c1b8a6d6d5470d5ef94d">nextFrame</a> = NULL;
-<a name="l00065"></a>00065 <span class="comment">// private QTimer *frametimer from class definition</span>
-<a name="l00066"></a>00066 <a class="code" href="classQOpenCamWidget.html#2e70551b39fd2bd15fc99ca4fa12107f">frametimer</a> = NULL;
-<a name="l00067"></a>00067 <span class="comment">// private QVBoxLayout *layout from class definition</span>
-<a name="l00068"></a>00068 <a class="code" href="classQOpenCamWidget.html#e91d147fdd20819b56ebd7861d7ab44e">layout</a> = <span class="keyword">new</span> QVBoxLayout(<span class="keyword">this</span>);
-<a name="l00069"></a>00069
-<a name="l00070"></a>00070 <span class="comment">// private QLabel *canvas from class definition</span>
-<a name="l00071"></a>00071 <a class="code" href="classQOpenCamWidget.html#7ac719f26d5f4a0a80ac6e4ffd4fe46d">canvas</a> = <span class="keyword">new</span> QLabel(<span class="keyword">this</span>);
-<a name="l00072"></a>00072 <a class="code" href="classQOpenCamWidget.html#7ac719f26d5f4a0a80ac6e4ffd4fe46d">canvas</a>->setMinimumSize(200, 100);
-<a name="l00073"></a>00073 <a class="code" href="classQOpenCamWidget.html#7ac719f26d5f4a0a80ac6e4ffd4fe46d">canvas</a>->setAlignment(Qt::AlignCenter);
-<a name="l00074"></a>00074
-<a name="l00075"></a>00075 <span class="comment">// private QPushButton *trigger from class definition</span>
-<a name="l00076"></a>00076 <a class="code" href="classQOpenCamWidget.html#a0aaf9bfc43d01979a7af03741620624">trigger</a> = <span class="keyword">new</span> QPushButton(<span class="keyword">this</span>);
-<a name="l00077"></a>00077 <a class="code" href="classQOpenCamWidget.html#a0aaf9bfc43d01979a7af03741620624">trigger</a>->setText(<span class="stringliteral">"Take picture"</span>);
-<a name="l00078"></a>00078 <a class="code" href="classQOpenCamWidget.html#a0aaf9bfc43d01979a7af03741620624">trigger</a>->setEnabled(<span class="keyword">false</span>);
-<a name="l00079"></a>00079 <a class="code" href="classQOpenCamWidget.html#a0aaf9bfc43d01979a7af03741620624">trigger</a>->hide();
-<a name="l00080"></a>00080
-<a name="l00081"></a>00081 <span class="comment">// private bool trigger_active from class definition</span>
-<a name="l00082"></a>00082 <a class="code" href="classQOpenCamWidget.html#1718e4971977520cfe642daa78e1997e">trigger_active</a> = <span class="keyword">false</span>;
-<a name="l00083"></a>00083
-<a name="l00084"></a>00084 <a class="code" href="classQOpenCamWidget.html#e91d147fdd20819b56ebd7861d7ab44e">layout</a>->addWidget(<a class="code" href="classQOpenCamWidget.html#7ac719f26d5f4a0a80ac6e4ffd4fe46d">canvas</a>);
-<a name="l00085"></a>00085 this->setLayout(<a class="code" href="classQOpenCamWidget.html#e91d147fdd20819b56ebd7861d7ab44e">layout</a>);
-<a name="l00086"></a>00086 }
-<a name="l00087"></a>00087
-<a name="l00088"></a><a class="code" href="classQOpenCamWidget.html#b0ad4890d7d638354289e074a6f71a3f">00088</a> <a class="code" href="classQOpenCamWidget.html#b0ad4890d7d638354289e074a6f71a3f">QOpenCamWidget::~QOpenCamWidget</a>(<span class="keywordtype">void</span>)
-<a name="l00089"></a>00089 {
-<a name="l00090"></a>00090 cvReleaseCapture( &<a class="code" href="classQOpenCamWidget.html#fde0c9d47e2ea44f2aeea499fd570368">capture</a> );
-<a name="l00091"></a>00091 <span class="keyword">delete</span> <a class="code" href="classQOpenCamWidget.html#7ac719f26d5f4a0a80ac6e4ffd4fe46d">canvas</a>;
-<a name="l00092"></a>00092 <span class="keyword">delete</span> <a class="code" href="classQOpenCamWidget.html#a0aaf9bfc43d01979a7af03741620624">trigger</a>;
-<a name="l00093"></a>00093 }
-<a name="l00094"></a>00094 <span class="comment">// ------------------------------------------------------------- //</span>
-<a name="l00095"></a>00095 <span class="comment">// Public methods (not signals/slots)</span>
-<a name="l00096"></a>00096 <span class="comment">// ------------------------------------------------------------- //</span>
-<a name="l00097"></a>00097
-<a name="l00109"></a>00109 <span class="keywordtype">void</span>
-<a name="l00110"></a><a class="code" href="classQOpenCamWidget.html#8f885a8bb88870cd19cfc9eb4e02e2ce">00110</a> <a class="code" href="classQOpenCamWidget.html#8f885a8bb88870cd19cfc9eb4e02e2ce" title="Changes the visibility of the optional built-in &quot;Take snapshot&quot; button...">QOpenCamWidget::setSnapshotVisible</a>(<span class="keywordtype">bool</span> visible)
-<a name="l00111"></a>00111 {
-<a name="l00112"></a>00112 <span class="comment">// Checking both parameter and private "sanity" variable,</span>
-<a name="l00113"></a>00113 <span class="comment">// as a sanity- and error-control</span>
-<a name="l00114"></a>00114 <span class="keywordflow">if</span> ( visible && !<a class="code" href="classQOpenCamWidget.html#1718e4971977520cfe642daa78e1997e">trigger_active</a> )
-<a name="l00115"></a>00115 {
-<a name="l00116"></a>00116 connect( <a class="code" href="classQOpenCamWidget.html#a0aaf9bfc43d01979a7af03741620624">trigger</a>, SIGNAL(clicked()), <span class="keyword">this</span>, SLOT(<a class="code" href="classQOpenCamWidget.html#82540c90d3efa85631f13af3a60fa94b" title="Trigger this slot to save a frame from the widget.">startSnap</a>()));
-<a name="l00117"></a>00117 <a class="code" href="classQOpenCamWidget.html#e91d147fdd20819b56ebd7861d7ab44e">layout</a>->addWidget(<a class="code" href="classQOpenCamWidget.html#a0aaf9bfc43d01979a7af03741620624">trigger</a>);
-<a name="l00118"></a>00118 <a class="code" href="classQOpenCamWidget.html#a0aaf9bfc43d01979a7af03741620624">trigger</a>->show();
-<a name="l00119"></a>00119 <a class="code" href="classQOpenCamWidget.html#1718e4971977520cfe642daa78e1997e">trigger_active</a> = <span class="keyword">true</span>;
-<a name="l00120"></a>00120 }
-<a name="l00121"></a>00121 <span class="keywordflow">if</span> ( !visible && <a class="code" href="classQOpenCamWidget.html#1718e4971977520cfe642daa78e1997e">trigger_active</a> )
-<a name="l00122"></a>00122 {
-<a name="l00123"></a>00123 <a class="code" href="classQOpenCamWidget.html#e91d147fdd20819b56ebd7861d7ab44e">layout</a>->removeWidget(<a class="code" href="classQOpenCamWidget.html#a0aaf9bfc43d01979a7af03741620624">trigger</a>);
-<a name="l00124"></a>00124 disconnect( <a class="code" href="classQOpenCamWidget.html#a0aaf9bfc43d01979a7af03741620624">trigger</a>, SIGNAL(clicked()), 0, 0 );
-<a name="l00125"></a>00125 <a class="code" href="classQOpenCamWidget.html#a0aaf9bfc43d01979a7af03741620624">trigger</a>->hide();
-<a name="l00126"></a>00126 <a class="code" href="classQOpenCamWidget.html#1718e4971977520cfe642daa78e1997e">trigger_active</a> = <span class="keyword">false</span>;
-<a name="l00127"></a>00127 }
-<a name="l00128"></a>00128 }
-<a name="l00143"></a>00143 <span class="keywordtype">void</span>
-<a name="l00144"></a><a class="code" href="classQOpenCamWidget.html#c6186d1e510b5c8635b2d3bf5d94def6">00144</a> <a class="code" href="classQOpenCamWidget.html#c6186d1e510b5c8635b2d3bf5d94def6" title="A paint event is a request to repaint all or part of a widget.">QOpenCamWidget::paintEvent</a> ( QPaintEvent * event )
-<a name="l00145"></a>00145 {
-<a name="l00146"></a>00146 QPainter * paint = <span class="keyword">new</span> QPainter;
-<a name="l00147"></a>00147 paint->begin(<span class="keyword">this</span>);
-<a name="l00148"></a>00148
-<a name="l00149"></a>00149 <span class="keywordflow">if</span> ( <a class="code" href="classQOpenCamWidget.html#92dab283a477c1b8a6d6d5470d5ef94d">nextFrame</a> )
-<a name="l00150"></a>00150 {
-<a name="l00151"></a>00151 <span class="comment">// Using this objects painter to draw the image</span>
-<a name="l00152"></a>00152 <span class="comment">// causes a cute, but not desired effect..</span>
-<a name="l00153"></a>00153 <span class="comment">//paint->drawImage(event->rect(), *nextFrame);</span>
-<a name="l00154"></a>00154
-<a name="l00155"></a>00155 <span class="comment">// Until I find a better solution on how to do the</span>
-<a name="l00156"></a>00156 <span class="comment">// redraw of the image, setPixmap on the canvas</span>
-<a name="l00157"></a>00157 <span class="comment">// does do the job. This may cause a performance</span>
-<a name="l00158"></a>00158 <span class="comment">// penalty though, and is considered a FIXME</span>
-<a name="l00159"></a>00159 <span class="comment">// Another drawback is that the widget does not resize..</span>
-<a name="l00160"></a>00160 <a class="code" href="classQOpenCamWidget.html#7ac719f26d5f4a0a80ac6e4ffd4fe46d">canvas</a>->setPixmap( QPixmap::fromImage(*<a class="code" href="classQOpenCamWidget.html#92dab283a477c1b8a6d6d5470d5ef94d">nextFrame</a>) );
-<a name="l00161"></a>00161 }
-<a name="l00162"></a>00162 <span class="keywordflow">else</span>
-<a name="l00163"></a>00163 {
-<a name="l00164"></a>00164 <a class="code" href="classQOpenCamWidget.html#7ac719f26d5f4a0a80ac6e4ffd4fe46d">canvas</a>->setText(<span class="stringliteral">"No data, check/test camera"</span>);
-<a name="l00165"></a>00165 }
-<a name="l00166"></a>00166 paint->end();
-<a name="l00167"></a>00167 }
-<a name="l00168"></a>00168
-<a name="l00169"></a>00169
-<a name="l00182"></a>00182 <span class="keywordtype">bool</span>
-<a name="l00183"></a><a class="code" href="classQOpenCamWidget.html#23574314cbd7a74bc6f32a640041d55a">00183</a> <a class="code" href="classQOpenCamWidget.html#23574314cbd7a74bc6f32a640041d55a" title="Grabs an OpenCV video capture source.">QOpenCamWidget::grabCapture</a>(<span class="keywordtype">int</span> source)
-<a name="l00184"></a>00184 {
-<a name="l00185"></a>00185 <a class="code" href="classQOpenCamWidget.html#fde0c9d47e2ea44f2aeea499fd570368">capture</a> = cvCaptureFromCAM(0);
-<a name="l00186"></a>00186 <span class="keywordflow">if</span> (!<a class="code" href="classQOpenCamWidget.html#fde0c9d47e2ea44f2aeea499fd570368">capture</a>)
-<a name="l00187"></a>00187 {
-<a name="l00188"></a>00188 qDebug() << <span class="stringliteral">"QOpenCamWidget::grabCapture("</span> << source << <span class="stringliteral">") failed"</span>;
-<a name="l00189"></a>00189 <span class="keywordflow">return</span> <span class="keyword">false</span>;
-<a name="l00190"></a>00190 }
-<a name="l00191"></a>00191 cvGrabFrame(<a class="code" href="classQOpenCamWidget.html#fde0c9d47e2ea44f2aeea499fd570368">capture</a>); <span class="comment">// Grab a single frame, do resizing based on it.</span>
-<a name="l00192"></a>00192 IplImage *image = cvRetrieveFrame(<a class="code" href="classQOpenCamWidget.html#fde0c9d47e2ea44f2aeea499fd570368">capture</a>);
-<a name="l00193"></a>00193 QSize t_size = QSize(image->width,image->height);
-<a name="l00194"></a>00194
-<a name="l00195"></a>00195 qDebug() << <span class="stringliteral">"Device image format: "</span> << image->width << <span class="stringliteral">"x"</span> << image->height;
-<a name="l00196"></a>00196 <a class="code" href="classQOpenCamWidget.html#7ac719f26d5f4a0a80ac6e4ffd4fe46d">canvas</a>->setMinimumSize(t_size);
-<a name="l00197"></a>00197 <a class="code" href="classQOpenCamWidget.html#7ac719f26d5f4a0a80ac6e4ffd4fe46d">canvas</a>->setMaximumSize(t_size);
-<a name="l00198"></a>00198
-<a name="l00199"></a>00199 <span class="keywordflow">return</span> <span class="keyword">true</span>;
-<a name="l00200"></a>00200 }
-<a name="l00201"></a>00201
-<a name="l00216"></a>00216 <span class="keywordtype">void</span>
-<a name="l00217"></a><a class="code" href="classQOpenCamWidget.html#b378daa447e8d9b94e1c7c8c6853b880">00217</a> <a class="code" href="classQOpenCamWidget.html#b378daa447e8d9b94e1c7c8c6853b880" title="Starts up grabbing of video frames.">QOpenCamWidget::startCapture</a>(<span class="keywordtype">void</span>)
-<a name="l00218"></a>00218 {
-<a name="l00219"></a>00219 <a class="code" href="classQOpenCamWidget.html#2e70551b39fd2bd15fc99ca4fa12107f">frametimer</a> = <span class="keyword">new</span> QTimer(<span class="keyword">this</span>);
-<a name="l00220"></a>00220 <a class="code" href="classQOpenCamWidget.html#2e70551b39fd2bd15fc99ca4fa12107f">frametimer</a>->start(70);
-<a name="l00221"></a>00221 connect(<a class="code" href="classQOpenCamWidget.html#2e70551b39fd2bd15fc99ca4fa12107f">frametimer</a>,SIGNAL(timeout()), <span class="keyword">this</span>,SLOT(<a class="code" href="classQOpenCamWidget.html#27c30cec9a8d44c1802e4218bea7bdb4" title="Grabs a frame and causes an update() when triggered.">grabFrame</a>()));
-<a name="l00222"></a>00222 <a class="code" href="classQOpenCamWidget.html#a0aaf9bfc43d01979a7af03741620624">trigger</a>->setEnabled(<span class="keyword">true</span>);
-<a name="l00223"></a>00223 }
-<a name="l00224"></a>00224
-<a name="l00240"></a>00240 QImage*
-<a name="l00241"></a><a class="code" href="classQOpenCamWidget.html#aba8721f46b41d76326e048e3c876f1d">00241</a> <a class="code" href="classQOpenCamWidget.html#aba8721f46b41d76326e048e3c876f1d" title="Converts from the OpenCV IplImage data structure to a QImage.">QOpenCamWidget::Ipl2QImage</a>(<span class="keyword">const</span> IplImage *img)
-<a name="l00242"></a>00242 {
-<a name="l00243"></a>00243 IplImage *tmp=cvCloneImage(img);
-<a name="l00244"></a>00244 cvConvertImage(img,tmp, CV_CVTIMG_SWAP_RB );
-<a name="l00245"></a>00245 QImage * qimage = <span class="keyword">new</span> QImage(reinterpret_cast<uchar*>(tmp->imageData),
-<a name="l00246"></a>00246 tmp->width,
-<a name="l00247"></a>00247 tmp->height,
-<a name="l00248"></a>00248 3* tmp->width,
-<a name="l00249"></a>00249 QImage::Format_RGB888);
-<a name="l00250"></a>00250 <span class="keywordflow">return</span> qimage;
-<a name="l00251"></a>00251
-<a name="l00252"></a>00252 }
-<a name="l00253"></a>00253 <span class="comment">// ------------------------------------------------------------- //</span>
-<a name="l00254"></a>00254 <span class="comment">// Public SLOTS</span>
-<a name="l00255"></a>00255 <span class="comment">// ------------------------------------------------------------- //</span>
-<a name="l00256"></a>00256
-<a name="l00266"></a><a class="code" href="classQOpenCamWidget.html#27c30cec9a8d44c1802e4218bea7bdb4">00266</a> <span class="keywordtype">void</span> <a class="code" href="classQOpenCamWidget.html#27c30cec9a8d44c1802e4218bea7bdb4" title="Grabs a frame and causes an update() when triggered.">QOpenCamWidget::grabFrame</a>(<span class="keywordtype">void</span>)
-<a name="l00267"></a>00267 {
-<a name="l00268"></a>00268 <span class="keywordflow">if</span> ( !<a class="code" href="classQOpenCamWidget.html#fde0c9d47e2ea44f2aeea499fd570368">capture</a> )
-<a name="l00269"></a>00269 {
-<a name="l00270"></a>00270 qDebug() << <span class="stringliteral">"Capture device not ready!"</span>;
-<a name="l00271"></a>00271 <span class="keywordflow">return</span>;
-<a name="l00272"></a>00272 }
-<a name="l00273"></a>00273
-<a name="l00274"></a>00274 cvGrabFrame(<a class="code" href="classQOpenCamWidget.html#fde0c9d47e2ea44f2aeea499fd570368">capture</a>);
-<a name="l00275"></a>00275
-<a name="l00276"></a>00276 IplImage *iplimage = cvRetrieveFrame(<a class="code" href="classQOpenCamWidget.html#fde0c9d47e2ea44f2aeea499fd570368">capture</a>);
-<a name="l00277"></a>00277
-<a name="l00278"></a>00278 <span class="keywordflow">if</span> (iplimage)
-<a name="l00279"></a>00279 {
-<a name="l00280"></a>00280 <a class="code" href="classQOpenCamWidget.html#92dab283a477c1b8a6d6d5470d5ef94d">nextFrame</a> = <a class="code" href="classQOpenCamWidget.html#aba8721f46b41d76326e048e3c876f1d" title="Converts from the OpenCV IplImage data structure to a QImage.">Ipl2QImage</a>(iplimage);
-<a name="l00281"></a>00281 }
-<a name="l00282"></a>00282 <span class="keywordflow">else</span>
-<a name="l00283"></a>00283 {
-<a name="l00284"></a>00284 <a class="code" href="classQOpenCamWidget.html#92dab283a477c1b8a6d6d5470d5ef94d">nextFrame</a> = NULL;
-<a name="l00285"></a>00285 }
-<a name="l00286"></a>00286 update();
-<a name="l00287"></a>00287 }
-<a name="l00288"></a>00288
-<a name="l00306"></a><a class="code" href="classQOpenCamWidget.html#82540c90d3efa85631f13af3a60fa94b">00306</a> <span class="keywordtype">void</span> <a class="code" href="classQOpenCamWidget.html#82540c90d3efa85631f13af3a60fa94b" title="Trigger this slot to save a frame from the widget.">QOpenCamWidget::startSnap</a>(<span class="keywordtype">void</span>)
-<a name="l00307"></a>00307 {
-<a name="l00308"></a>00308 <span class="keywordflow">if</span> ( <a class="code" href="classQOpenCamWidget.html#2e70551b39fd2bd15fc99ca4fa12107f">frametimer</a> ) {
-<a name="l00309"></a>00309 <span class="keywordflow">if</span> (<a class="code" href="classQOpenCamWidget.html#2e70551b39fd2bd15fc99ca4fa12107f">frametimer</a>->isActive())
-<a name="l00310"></a>00310 {
-<a name="l00311"></a>00311 <a class="code" href="classQOpenCamWidget.html#2e70551b39fd2bd15fc99ca4fa12107f">frametimer</a>->stop();
-<a name="l00312"></a>00312 qDebug() << <span class="stringliteral">"SNAP!"</span>;
-<a name="l00313"></a>00313
-<a name="l00314"></a>00314 emit <a class="code" href="classQOpenCamWidget.html#d410be92ce25ff591726ba255070d09e">imageReady</a>(QImage(*<a class="code" href="classQOpenCamWidget.html#92dab283a477c1b8a6d6d5470d5ef94d">nextFrame</a>));
-<a name="l00315"></a>00315 <a class="code" href="classQOpenCamWidget.html#2e70551b39fd2bd15fc99ca4fa12107f">frametimer</a>->start();
-<a name="l00316"></a>00316 }
-<a name="l00317"></a>00317 }
-<a name="l00318"></a>00318 }
-<a name="l00319"></a>00319
-</pre></div></div>
-<hr size="1"><address style="text-align: right;"><small>Generated on Thu Jun 11 01:49:57 2009 for QOpenCamWidget by
-<a href="http://www.doxygen.org/index.html">
-<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.6 </small></address>
-</body>
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